More from NBC

A wildfire burns in the hills just north of the San Gabriel Valley community of Glendora, Calif., on Jan 16, 2014.

IPCC Sharpens Warnings in Draft of New Climate Change Report

Global warming is here, human-caused and probably already dangerous — and it's increasingly likely that the heating trend could be irreversible, a draft of a new international science report says. The United Nations' Intergovernmental Panel on Climate Change on Monday sent governments a final draft of its synthesis report, which combines three earlier documents. There is little in the report that wasn't in the other more-detailed versions, but the language is more stark and the report attempts to connect the different scientific disciplines studying problems caused by the burning of fossil fuels, such as coal, oil and gas.

The 127-page draft paints a harsh warning of what's causing global warming and what it will do. "Continued emission of greenhouse gases will cause further warming and long-lasting changes in all components of the climate system, increasing the likelihood of severe, pervasive and irreversible impacts for people and ecosystems," the report says. It mentions rising sea levels and extreme weather, such as heat waves, flooding and droughts. The final report will be issued after governments and scientists go over the draft in October in Copenhagen.